Are you looking for the fire sprinkler design to be integrated with the calcs and stocklisting? If so, AutoSprink is by far the best. It does not technically require AutoCAD at all, but I would say that you will need to have AutoCAD for some cleanup and such on the drawings.
If you want a standalone stocklisting and calc program, HydraCAD is really good. It is also a good drawing / calc / listing program,
Travis Mack
MFP Design, LLC